Brake-shoe



(No Model.) 1

-W. D. SARGENT.

BRAKE SHOE. No. 468,581. Patented Feb. 9, 1892.

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UNITED STATES PATENT OFFICE.

WVILLIAM D. SARGENT, OF EVANSTON, ASSIGNOR TO THE OONGDON BRAKE SHOE COMPANY, OF CHICAGO, ILLINOIS.

BRAKE-SHOE.

SPECIFICATION forming part of Letters Patent No. 468,581, dated February 9, 1892. Application filed August 10, 1891. Serial No. 402,253. (No model.)

To all whom it may concern:

Beit known that I, WILLIAM D. SARGENT, a citizen of the United States, residing at Evanston, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Brake-Shoes, of which the following is a specification.

My invention relates to an improvementin the form of brake-shoe having laterally of its tread portion a flange to be applied for its braking effect to the flange of the wheel when the shoe-tread is applied against the outer tread of the wheel.

The principal object of myimprovement is to provide for equalizing or practically equalizing the bearing-friction of the flange and tread of the shoe against the corresponding parts of the wheel, and I accomplish this end by the construction illustrated in the accompanying drawings, in which Figure 1 is a plan View presenting the bear- .ing side of a brake-shoe of my improved construction, and Fig. 2 is a section taken at the line 2 2 on Fig. 1, and viewed as indicated by the arrows.

A is the brake-shoe, of which 15 is the tread and O the flange. At intervals in the hearing side of the flange O, I provide recesses or chambers 19, separated by transverse conoave ribs r, which should conform more or less accurately to the cross-section of the wheelflange. These ribs, separated as they are by the chambers 19, comprise a comparatively small portion of the area of the bearing side of the shoe-flange, and are proportioned to afford substantially the same degree of friction when applied to the Wheel-flange as the shoe-tread affords when applied to the tread of the wheel, thereby to equalize the bearing effect of the two parts of the shoe. The c'ham- 4c bers 12 should flare laterally, as illustrated, to clear at their outer sides the sides of the wheel-flange between adjacent ribs 0", and they should also flare outwardlyin the direction lengthwise of the flange to render the ribs tapering and thus broadest toward their bases to afford to them the greater strength. By the lateral clearance referred to the frictional area of the shoe-flange does not, as in other flanged shoes, materiallyincrease, as the shoe-flange wears down with use and 0011- forms to the wheel-flange. 1

That I claim as new, and desire to secure by Letters Patent, is-

1. A brake-shoe having transverse concave ribs at intervals along the inner side of its flange and forming the bearing-surface thereof, and chambers in the shoe-flange between the said ribs, said chambers flaring laterally outward to clear the sides of the wheel-flange, substantially as described.

2. A brake-shoe A, comprising the tread portion B and flange O, having outwardlytapering concave transverse ribs 1' at intervals along its inner side and between the ribs chambers 19, flaring laterally outward to clear the sides of the wheel-flange,substantially as described.

M. D. SARGENT.

In presence of- A. DYRENFORTH, M. J. FROST. 

